Biodegradable knife



FIG. 1 is a front side perspective view of a biodegradable knife showing my new design;

FIG. 2 is a rear side perspective view of the biodegradable knife as shown in FIG. 1;

FIG. 3 is a front elevational view in enlarge scale of the biodegradable knife as shown in FIG. 1;

FIG. 4 is a rear elevational view in enlarge scale of the biodegradable knife as shown in FIG. 1;

FIG. 5 is a left side elevational view of the biodegradable knife as shown in FIG. 1;

FIG. 6 is a right side elevational view of the biodegradable knife as shown in FIG. 1;

FIG. 7 is a top plan view of the biodegradable knife as shown in FIG. 1; and,

FIG. 8 is a bottom plan view of the biodegradable knife as shown in FIG. 1. 

CLAIM The ornamental design for a biodegradable knife, as shown and described. 